<template>
	<view>
		<my-search @myclick="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh+'px'}">
				<!-- 根据active判断选中项 -->
				<view @click="changeActive(i)" :class="['left-scroll-view-item',i === active? 'active' : '']" v-for="(item,i) in cateList" :key="i">{{item.cat_name}}</view>
			</scroll-view>
			<scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in catelevel2" :key="i2">
					<view class="cate-lv2-title">
						/{{item2.cat_name}}/
					</view>
					<view class="cate-lv2-list">
						<view class="cate-lv2-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<img :src="item3.cat_icon" alt="" />
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				//当前设备可用高度
				wh:0,
				cateList:[],
				active: 0,
				//二级分类列表
				catelevel2:[],
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight-50
			this.getCateList()
		},
		methods:{
			//获取分类列表的数据
			async getCateList(){
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.catelevel2 = res.message[0].children
			},
			changeActive(i){
				this.scrollTop=this.scrollTop ===0 ? 1 : 0				
				this.active=i
				this.catelevel2=this.cateList[i].children
			},
			gotoGoodsList(item3){
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid='+item3.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
}
.left-scroll-view{
	width: 120px;
	.left-scroll-view-item{
		background-color: #f7f7f7;
		line-height: 60px;
		text-align: center;
		font-size: 12px;
		&.active {
			background-color: #fff;
			position: relative;
			&::before {
				content: '';
				display: block;
				width: 3px;
				height: 30px;
				background-color: #c00000;
				position: absolute;
				top:50%;
				left:0;
				transform: translateY(-50%);
			}
		}
	}
}
.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv2-list{
	display: flex;
	// 到头后自动换行
	flex-wrap: wrap;
	.cate-lv2-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		image {
			width: 60px;
			height: 60px;
		}
		text {
			font-size: 12px;
		}
	}
}
</style>
